there is no doubt that we should chant all the time but what if we are in a car or a train or at home but with other members who don't want to hear that? I share a room with my sister and she's not exactly interested so it get's a little hard to chant at all times. so can I chant in my mind? i know devotees say not to and I don't chant my rounds in silence (unless it's necessary to, like a train as I said) but if I want to chant all the time then many times I can only chant in my mind. say I'm running, it would get really hard for me to chant (maybe it's just my stamina) so can I chant in my mind in these situations?